251422340 has 48 divisors (see below), whose sum is σ = 569901360. Its totient is φ = 92620800.

The previous prime is 251422337. The next prime is 251422349. The reversal of 251422340 is 43224152.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 14077504 + 237344836 = 3752^2 + 15406^2 .

It is not an unprimeable number, because it can be changed into a prime (251422349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155456 + ... + 157064.

It is an arithmetic number, because the mean of its divisors is an integer number (11872945).

Almost surely, 2^251422340 is an apocalyptic number.

251422340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251422340 is an abundant number, since it is smaller than the sum of its proper divisors (318479020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251422340 is a wasteful number, since it uses less digits than its factorization.

251422340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2232 (or 2230 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 251422340 is about 15856.3028477637. The cubic root of 251422340 is about 631.1529571438.

Adding to 251422340 its reverse (43224152), we get a palindrome (294646492).

The spelling of 251422340 in words is "two hundred fifty-one million, four hundred twenty-two thousand, three hundred forty".